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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '441b758ab168e4e6e71ef977560270d0d19724620e16a1b98b19d1e43a86aed1' 
  AND token = 'ZyYNeGWhf1A78PV9dx67/QQWdScW/Tl1FrVwERHrfJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}